pmdalio(1) — Linux manual page


PMDALIO(1)                 General Commands Manual                PMDALIO(1)

NAME         top

       pmdalio - Linux LIO subsystem PMDA

DESCRIPTION         top

       pmdalio is a Performance Metrics Domain Agent (PMDA) which exports
       metric values about the Linux I/O target subsystem, which provides
       for protocols like iSCSI, FCP, FCoE.  These allow storage available
       on one host to be exported and consumed by other hosts using industry
       standard protocols.

       This PMDA exports summary metrics which are performance value
       aggregations and configuration per LIO target instance.
       Additionally, it provides per LUN performance metrics including IOPS,
       and READ and WRITE throughput.

       The LIO configuration is maintained within the kernel's configfs
       virtual filesystem.  The python-rtslib module provides an interface
       to configfs, allowing tools like pmdalio to interact with the
       settings and metadata held in configfs.

INSTALLATION         top

       Install the lio PMDA by using the Install script as root:

           # cd $PCP_PMDAS_DIR/lio
           # ./Install

       To uninstall, do the following as root:

           # cd $PCP_PMDAS_DIR/lio
           # ./Remove

       pmdalio is launched by pmcd(1) and should never be executed directly.
       The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

FILES         top

           installation script for the pmdalio agent

           undo installation script for the pmdalio agent

           default log file for error messages from pmdalio


       Environment variables with the prefix PCP_ are used to parameterize
       the file and directory names used by PCP. On each installation, the
       file /etc/pcp.conf contains the local values for these variables.
       The $PCP_CONF variable may be used to specify an alternative
       configuration file, as described in pcp.conf(5).

SEE ALSO         top

       PCPIntro(1), pmcd(1), pminfo(1) and pmpython(1).

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨⟩.
       If you have a bug report for this manual page, send it to  This page was obtained from the project's upstream
       Git repository ⟨⟩ on
       2020-08-13.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-08-11.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to

Performance Co-Pilot                 PCP                          PMDALIO(1)